New Skylake MacBook Pros coming October 27.
An iPad 3 'Retina Display' Comparison Graphic
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That is, assuming that the iPad 3 does come with the long rumored "Retina Display". The most recent evidence suggesting that it is the case was a New York Times report last week in which an anonymous Apple employee said the new iPad would have a "truly amazing screen". Other evidence has leaked out over the past year with Apple including double-resolution iPad artwork in their applications, and numerous supply chain reports.
The graphic shows all screen resolutions relative to each other assuming that they all had the same DPI (dots per inch). The iPad 3 screen is actually believed to be the same physical size as the iPad 2, but carry twice the density of pixels. This should result in a much sharper images on the iPad 3 as compared to the previous models. 3rd party applications will have to be updated to support the higher resolution display and Apple is reportedly lining up demos for the March launch.